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(NoModel.)

T. S. WILKIN.

SAW MILL DOG. No. 313,395. Patented Mar. 3, 1885.

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uiiiiiiiiiiillmiiimmr""g THEODOR-E S. VILKIN, OF MILVAUKEE, VISCONSIN.

SAW-MILL DOG.

Application filed July 7, 1884.

To all whom t may concern.-

Be it known thatr I, TunoDoRn-SAMUEL VILKIN, of Milwaukee, in the county of Milwaukee and State of Wisconsin,have invented certain new and useful Improvements in Saw- Mill Set-W'orks, of which the following is a specification.

My invention relates to saw-mill machinery, and particularly to the dogging apparatus for holding the log or cant while sawing.

The invention consists in a clogging mechanism operated by steam or like pressure, all the dogs of one carriage being under the control of the same attendant who controls the movements of the carriage and of the knees.

In the accompanying drawings, Figure l is a perspective view of a saw-mill carriage, showing the set works provided with the steam-actuating mechanism; Fig. 2, avertical section through the center of one of the steam-cylinders and transversely through the carriage; Fig. 8, a transverse section through the carriage at one side of the cylinder; Fig. 4, an enlarged sectional View of the four-way valve.

As hitherto constructed saw-mill set-works have required several attendants, or a vast amount of work from the one or two attendants employed, necessitating their movement from place to place for the manipulation of the various levers and appliances necessarily incident to such machinery.

In a former patent'granted to me bearing date the 22d day ot' January, 1884, and numbered 292,271, is described a novel construction and arrangement of mechanism for facilitating the operation or control of the various parts with little or no movement of the operator from point to point; and the present invention is designed to further improve and simplify the construction therein shown and described, so that the attendant shall be relieved of much of the actual labor of manipulating the machinery, as well as enabled to perform the necessary work in a more expeditious and satisfactory manner, all the dogs being operated simultaneously, if desired.

Referring, again, to the drawings, A indicates a saw-mill carriage provided with wheels a,which travel upon rails b and guide the carrage in its movements. Upon the carriage farming par of Letters Patent No. 313,395, dated March 3, 1885.

(No model.)

are secured the usual head-blocks, B,on which the knees C travel back and forth, carrying dogs D,which in the present instance are represented as the well-known Reliance pat tern, but which may obviously be of any other known orapproved form. The knees C are formed with a rack-bar on their under faces, and moved forward and backward by pinions on a divided sha-ft in the usual manner, and all the other parts shown and not hereinafter particularly described are of ordinary construction and arrangement, or of the special construction and arrangement set forth in my aforesaid former patent.

Upon each sliding knee Gis mounted a cylinder, E, within which is arranged a close-f1tting piston, F, the rod G of which passes through a stuffing-box or gland, e, and is connected by a link, H, with the lever I, by which the dogs l) are operated. Under this arrangement an upward or downward movement of the piston causes a corresponding npward or downward movement of the lever I of the dogs, and causes said dogs to open or close in the same manner as when the levers are operated by hand in the ordinary way. The pistons are moved by the pressure of any suit-able tluid-as steam, air, or water-tl1ough where steam is used to run the mill it will be found generally most convenient. The steam or other iiuid is admitted to the cylinder at or near its upper and lower ends, the same as in a steam-engine cylinder, its outlet and inlet being` controlled by a four-way cock or valve, J. (Shown more plainly in Fig. 4.) This valve is located at a point where pipes f and g branch off from the main pipe l, and pass to opposite ends of the cylinder, the valve being so arranged as to open communication from the main steam-pipe through pipe f with the upper end of the cylinder, and from the lower end of the cylinder through 'pipe g with the outlet 71, or from steam-pipe K through branch g with the lower end of the cylinder, and from the upper end of the cylinder by branch pipe f with the outlet It. This construction and arrangement of the valve is plainly illustrated in Figs. 2 and fl, and is a common and well-known plan for producing reverse movements of a piston, to which no claim is made. Two knees, each provided IOO with a set of dogs, are used on a saw-mill carl I do not in this application claim, broadly,

riage, and the knees are sometimes adjusted simultaneously and equally, and at other times independently or unequally. In order, therefore, to permit such independent movement of t-he knees, the Valves or their operating devices must be disconnected, and also for the further reason that it is often desirable to actuate the dogs independently. At the same time it is desirable that the attendant shall be able to control both valves, and consequently both sets of dogs, from the same point; and hence I provide each valve with a long valve rod or stem, t', reaching from the valves to a` point about midway between the two headblocks, or of such length as to meet or nearly meet at a point close to the levers which actuate the rock-shaft, control the ratchets, and operate the brake of the knee-setting mechanism, so that all thelevers shall be grouped in position to be readily reached and manipulated by the attendant without moving from his stand. Each valve-rod is furnished with a hand-lever, L, and travels back and forth upon a horizontal support, M, an anti-friction roller, j, being applied to each rod, if needed, to prevent their being turned by frictional contact. Instead of this arrangement a universal joint or coupling may be used to connect the valve plug and stem, or rod made telescopic, if desired, and the outer end of the rod Carried through an eye or opening in a fixed standard or support near the lever L.

It is likewise apparent that the valves may be controlled in a variety ot' waysas, for instance, by cords, bands, or chains passing therefrom upward over pulleys and down in easy reach of the attendant, a plan which is advantageous in that there is no danger of interference with the other levers or mechanism of the carriage when the knees are moved forward and backward thereon. So, too, the form of valve employed is immaterial, provided it permits the steam supply and eX- haust to be controlled in the manner explained. These details belong rather to the domain of mechanical skill than to that of invention, the invention in this case consisting, broadly, in providing the dogging mechanism of a sawmill carriage with apparatus whereby it may be operated by steam or other fluid. As the knees move back and forth on the carriage, and the carriage moves longitudinally along the track, it is necessary to provide for movement of the steam-supply pipes K and the main supply-pipe N, which Ipreferably do by making said pipes telescopic, as indicated in Figs. 1 and 2, but which may also be accomplished by the use of iiexible pipes. If the latter be used, it may be advantageously suspended from above, so as to be out of the way and avoid danger of becoming injured by wear in moving over the oor, or being cut or run over by the carriage, as well as avoiding liability of tripping or impeding the workmen.

the telescopic pipes for conveying fluid under pressure to a saw-mill carriage and to the mechanism thereon, as that constitutes the subject-matter-of another application iiled by me. Steam or other fluid will be taken from any convenient source through steam-pipes K.

Having thus described my invention, what I claim is I. In combination with a saw-mill dog, mechanism for actuating the same, consisting of a piston connected with the operating-lever of the dog, a cylinder containing said piston,

and adapted to hold a iiuid under pressure,

and avalve or controlling mechanism, substantially as described, adapted to permit the entrance of fluid on one side of the piston and the escape thereof from the other side alternately in opposite directions.

2. In combination with a saw-mill dog and its operating-lever, asteam-cylinder, a piston Within the cylinder, connected with the operating-lever of the dog, and a reversing-valve for admitting steam to opposite sides of the piston.

3. In combination with a saw-mill carriage, a head-block mounted upon the carriage, a knee movable upon the head-block, and a dog carried by the knee,and provided with an operating-lever, a cylinder carried by the movable knee, a piston fitting within said cylinder and connected with the operating-lever ot' the dog, and a pipe for supplying steam to the cylinder, connected to and movable Atherewith, substantially as set forth.

4. In combination with a longitudinallymovable saw-mill carriage, ahead-block mounted upon the carriage, a knee movable upon the head-block transversely of the carriage, and a dog carried by the knee, and provided with au operating-lever, a cylinder mounted upon the knee, a piston tting within the cylinder and connected with the operating lever of the dog, and a steam-pipe connected with the cylinder and movable in lines parallel with and at right angles to the length of the carriage.

5. In combination with a saw-mill carriage, two head-blocks mounted thereon, and each carrying a sliding knee provided with a dog and an operating-lever therefor, and with a cylinder, pistons fitting within said cylinders and connected with the operating-levers of the dogs, pipes for conducting steam or fluid to the cylinders, valves controlling the supply and exhaust ofthe steam or liuid, and independent rods or operating devices extending from the valves to a point intermediate between the two head-blocks, whereby both dogs may be controlled from the same point.

THEODORE S. WILKIN.

Witnesses:

ALBERT HoPPIN, WM. WV. ALLIs.

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